Steam-boiler



e. SBWBLL. STEAM BOILER.

Patented June 25, 1895. @ee-@@eeeeeeee@ een@ @D C@ C@ me? @D @D THE mmsvnzns oo. mofa-urna. wmmcon. u, c.

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k e u e UNTTED STATES PATENT Ciertos.

'GEORGE SEWELL', .OF BROOKLYN, NEW YORK.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 541,637, dated .Tune25, 18 95.

lApplication iiled Iuly 3, 1894. Serial No. 516,424. (No modeLl thenpoint out its novelty in claims.

tube-sheet A or A and an inner tube-sheet` B or B arranged parallel witheach other and united at their margins in any suitable man-V ner to formbetween them water spaces O and O.

D D are numerous water tubes of any con.- venient size arranged atsuitable distances apart and connecting the said hollow heads or walls,each of said tubes being fitted and secured water-tightand steam-tightin any suitable manner, as by expanding them into holes provided forthem in the several tube-sheets. The said tubes are closed at theirends, the closure being represented as made by plugs a secured tightlyinto the said tubes.

portions which are included within the water spaces O C. The said hollowheads or walls are represented as approximately vertical having only aslightinclination and the tubes D D are represented as approximatelyhorizontal having only a slight inclination corre- Y sponding with thatVof the inclination of the heads. The holes c nextthe higher ends of thetubes are represented in the upper sides" thereof and the holes c nextthe lower ends thereof are represented in their lower sides.

The two hollow heads or walls A B and A B containing the water spaces CC', are represented as having at their sides downward extensions E Ewhich form water legs which are closed at the bottom and which rest uponthe ground or upon a floor or other suitable The said tubes are providedwith holes c c' in thoseY foundation and by which the wholesuperstructure is supported. Below the watertubes and between the waterlegs E E is the fire chamber'F represented as furnished with 'a grate Gbelow whichthere is an ashpit -J.

The fire chamber E is represented as provided under the higher ends ofthe water tubes with a lire door H. The rear end of the furnace may beinclosed with brick-work or in any other suitable manner.

vBetween those parts of the water legs E E below the fire grate G, arearranged waterltubes I, the saidtubes I communicating with the waterspaces within the water legs E E', which spaces communicate with thewater fspaces C C surrunding the tubes D between their respectivetube-sheets A B and A B. The connections 'between' the tubesI and thewater spaces in the water legs may be made in any suitable mannerwhereby they are rendered water-tight. One of the said connections isrepresented in Fig. 2, as made by a stuffing-box d and a screw-plug e,the said stuffing-box being screw-threaded externally and screwedwater-'tight in both of the tubesheets A B or A B. The tube enters theinner end of the said stuffing-box and the part which projects into saidAbox is r'surrounded therein by a packing e*, preferably metallic.The'screwplug c is hollow and of an internal caliber to tit over the endof the tube I, but its outer end is inclosed and constructed to receivea wrench by which to screwit up against the packing e* for the purposeof tightening the said packing around the said tube. The saidstuffing-box and the screw-plug have corresponding lateral openings ethrough which the tube communicates with the water-space C or-C. Thismode of connecting a tube with two tube-sheets between which there is awater-,space might be employed in any part of the boiler.

The tube-sheets A B are connected togetherv between the tubes D D bymeans of hollow stay-bolts ffpreferably and'represented as consisting ofexternally screw-threaded tubes ICO off of the outsides ot the tubes bymeans of a steam blast introduced through said stay.- bolts. The saidstay-bolts aretitted with removable plugs g which remain in place whilethe boiler is in operation but are removed for the purpose of insertingthe steam jet nozzle by which the steam blast is introduced.

The upper parts of the hollow heads or walls A B and ABare without anytubes D. The front head A B is continued considerably higher than thetubes so that the upper part C* of its contained space may constitutesteam room from which the steam outlet is at h close to the top thereof.The said outlet h may have the steam pipe directly connected with it ormay have connected with it a steam drum with which the steam pipe isconnected.

rIhe watertubes D D are all inclosed at the top by a cover or roof Kwhich may be of sheet iron covered with asbestos or other nonconductorof heat. The said cover is represented as furnished with an outlet 7acommunicating with a smoke-stack orchimney. The sides ot the boilerbetween the heads A B and A B may be inclosed with masonry or othermaterial or may consist of holiow walls constituting water spaces.

I have represented the boiler as fed with water through a box L attachedto the upper part of the front head A B. The feed-pipe is intended to beconnected to this box at i. From this box several tubes j lead directlythrough the tube-sheets A B of the front head and the water-space Obetween the said tubesheets and through the innertuhe-sheet B of therear head A B', the said tubes running through the space above thewater-tubes D D for the purpose of heating the feed water by the gaseousproducts of combustion which proceed from the tire-chamber and circulateamong and between the water-tubes D D on their Way to the smoke-stack orchimney. The tubes j have water-tight joints in the tubesheets A B ofthe front head andin the front tubesheet B of the rear head so that theydeliver no water directly into the front waterspace C but only deliverit into the rear water-space C into which they open. From thiswater-space the water enters the tubes D D water space C to the rearWater space C is y downward from the said Water-space through the legsE, thence through tubes I under the fire grate into the rear water legsE', and thence upward to the water-space C.

What I claim as my invention isl. In a steam-boiler, the combinationwith two tubesheets having a water space between them anda watertube incommunication with said waterspace, of a stuffing-box screwed into bothof said tube-sheets and receiving at its inner end the communicating endof said water-tube,packing surrounding said tube within saidstuffing-box, a hollow plug having a closed outer end screwed into theouter end of said stuffing-box, the said stuffing-box and plug having anopening to the water-space between the tubessheets, substantially ashercin set forth.

2. In a water tube boiler, the combination of two heads or walls eachconsisting of two tube-sheets having a water-space between them, steamgenerating water-tubes inserted tightly into both tube-sheets of each ofsaid heads or walls and forming communication between the water-spacestherein, a fire-chamber between said heads or walls below saidwatentubes, a feed-water heating tube passing through both tube-sheetsof one of said heads or walls and its contained water'space, and passingthrough the innertube-shcet of the other of said heads or walls andentering its water-space, and a cover over said tirechamber and saidsteam-generating and water heating tubes, sltlstantially as herein setforth.

GEORGE SE WE LL.

Vitnesses:

FREDK. HAYNES, L. M. EGBERT.

